As I understand it, you want both your parents, all their descendants and all their ancestors on the chart. You can achieve this, but you have to cheat a little.
1 - Make a copy of your FTM file and work from it to make your chart.
2 - Create a new child to your parents - Unknown sex and with no name - actually you have to name it something so call it "."
3 - Disconnect yourself and all your siblings from your parents and make them children of "." using the Person--> Attach/Detach commands.
4 - Publish an Hourglass chart for "." Choose all the settings as required, but in Box and Line Styles people of unknown gender should have Border set at "None".
5 - Right-click on yourself and Select generation - move your generation up a little on the chart.
6 - "Share" to one-page pdf, if the chart is too big this will fail, and any print would have to be done directly from FamilyTreeMaker.
Hope this helps.